Lemme see if I can do it...
If you want to [i]italicize[/i], I think you have to do this [ i ] (but no spaces) right before, and then [ / i ] (no spaces) to end the italics. It might be the same with [b]bolding[/b], but make it [ b ] and [ / b ] to end it.
But I never get the quoting quite right...

Okay I was wrong. Trying again. (I'm just testing. Ignore me)
[quote]If you want to [italic]italicize[/italic], I think you have to do this [ italic ] (but no spaces) right before, and then [ / italic ] (no spaces) to end the italics. It might be the same with [bold]bolding[/bold], but make it [ bold ] and [ / bold ] to end it.
How irritating. Why can't they do it the normal way with [b] and [i]?